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I. H. POPPINK.

MEANS FOR MIXING STEAM WITH AIR. APPLICATION FILED was 25. 1919.

V //V Vf N 7019. 1/ [2 7 J00 fi/wankf Pogo/ k Patented Sept. 9,1919.

flffornay TED sTArns PATENT orrron.

JAIN" HENDRIK POPPINK, TILBURG, NETHERLANDS.

MEANS FOR MIXING STEAM WITH AIR.

To all whom itmayconoern:

Be it known that 1, JAN HENDRIK Por PINK, a subject of the Queen of Holland, residing at Tilburg, Netherlands, have 1nvented certain new and useful Improvements in Means for Mixing Steam with Air, of which the following is a specification.

It is well known in the art that mixing steam with air has some very distinct features for heating purposes. In the first place, the velocity of flow of said mixture through the conduits exceeds that of steam, assuming the initial pressure being the same in both cases. Moreover, the water 01' condensation in said mixture does not accumulate in the conduits, but it is taken upby the air and forced through the pipes, whereby a higher efficiency is obtained.

When endeavoring to mix steam with air with known means, however, it is found that it is impossible to draw the air in, by injector action, against any appreciable pressure. As soon as the back-pressure in the steam pipe rises even slightly, the steam escapes through the air suction orifice, thus rendering the apparatus inoperative. Owing to this fact, the use of a mixture of steam and air for heating purposes has been abandoned, especially as the admission of air under pressure is not economical, and in many instances impossible.

The present invention relates to an injector with which steam may be mixed with air without any difficulty being experienced.

lln the annexed drawing:

Figure 1 illustrates in cross-section an embodiment of the invention, and

Fig. 2 is a side view of the apparatus connected to a steam pipe.

The apparatus shown comprises a casing 1 in which a nozzle is secured by means of a screw member 2. Said nozzle is composed of two tightly fitting parts 3 and 4C. The parts 3 and 4 have registering openings 5 and 6 and are preferably provided with means (not shown) preventing relative rotation by which said openings might get out of register.

The parts 3 and 41 inclose an annular space 7 in communication through passages 8 with a chamber 8 into which steam of suitable pressure, for instance of 451bs (3 atmospheres) is admitted through a connecting branch 9 and a pipe 10. The space 7 has an annular outlet slot 7.

Specification of Letters Patent.

Patented sept. e, 1919.

' Application filed June 25, 1919. Serial No. 306.733.

Screwed into the part 3 of the nozzleisa central sleeve 11 having at its outlet end a double-coned portion 12. The outlet 13 of said sleeve 11 is adapted to be closed by a valve 1 1 on a spindle 15 to which longitudinal motion may be imparted by a hand wheel 16. The inner wall of the sleeve 11 is provided with projections 17 serving to guide the valve 1 1, a collar 18 having for its duty to secure the sleeve 11 in position.

The casing 1 further carries an outlet cone 19 having screw connection therewith, and an air inlet opening 20.

The apparatus is adapted to be screwed on a steam heating pipe 21.

The operation of my new apparatus is as follows:

When the stop valve (not shown) in the live steam inlet pipe 10 is opened, steam flows through the branch 9 into the chamher 8 thence through the passages 8 into the annular chamber 7 and through the annular slot 7* into the space inclosed by the cones 12 and 19. When escaping through the annular slot 7 the steam draws in air from the opening 20 both along the inner and the outer side of the nozzle 3, 4:; part of this air flows directly to the annular space between the exterior wall of nozzle 3, 4: and the interior wall of cone 19, whereas part takes its path through the passages 6, 5 to the annular space between the inner wall of the nozzle and the exterior wall of sleeve 11 and cone 12. The air is thereby thoroughly mixed with the steam, the mixture being forced at high velocity into the pipe 21.

In some cases a jet of live steam may be admitted into the pipe 21 by opening the valve 141, whereby the heating eifect may be regulated to a nicety as well as by throttling the admission of steam by means of the stop valve in pipe 10.

The annular slot 7* should be very narrow. In the embodiment shown in Fig. 1 the actual diameter of said slot is 59 millimeters, its width being somewhat less than 2, millimeter. It should further be noticed that the annular passages between the cones 12 and 19 onthe one side, and the nozzle 3, 4 on the other side should also be very narrow; in the example illustrated the actual width of these passages is millimeter and l millimeter respectively.

My new apparatus is also of value for exhaust steam heating. For this purpose the valve 14: remains closed so that the apparatus admits mostly air into the pipe 21.

Having now particularly described and ascertained the nature of my said invention and in What manner the same is to be performed, I declare that What I claim as my invention is:

In an apparatus for mixing steam and air, a casing, an air chamber, a steam chamber in said air chamber, said steam cham- 10 Walls of said steam chamber and an annular 15 outlet opening in the steam chamber.

In testimony whereof I my signature.

JAN HENDRIK POPPINK.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, I). O. 

